Mutual Induction
Trending Questions
- 2
- 3
- Zero
- 5
What is the dimension formula of the potential gradient?
- 2π
- 5π
- π
- 4π
A solenoid has 2000 turns wound over a length of 0.30 metre. The area of its cross-section is . Around its central section, a coil of 300 turns is wound. If an initial current of 2 A in the solenoid is reversed in 0.25 sec, then the e.m.f. induced in the coil is
- 48 mV
- 6 X 10-4 V
- 4.8 X 10-3 V
- 6 X 10-2 V
![](https://search-static.byjusweb.com/question-images/byjus/infinitestudent-images/ckeditor_assets/pictures/17436/content_imageedit_21_9085687015.png)
- 1.80×10−4 H
- 1.81×10−2 H
- 3.62×10−4 H
- None of the above
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1390938/original_9.qstn.png)
- adcb
- The current will reverse its direction as the electron goes past the loop
- No current is induced
- abcd
The coils A and B having turns and respectively are placed near each other, on passing a current of ampere on A, the flux linked with A is weber and with B it is weber. The mutual induction of the system is?
A hairpin-like shape as shown in the figure is made by bending a long current-carrying wire. What is the magnitude of a magnetic field at point which lies on the center of the semicircle?
- 3 V
- 0.75V
- 75 V
- Zero
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1422836/original_4q-1.png)
- Rotate in the direction opposite to the direction of magnet's motion
- Rotate in the same direction as the direction of magnet's motion
- Not rotate and its temperature will remain unchanged
- Not rotate, but its temperature will slowly rise
Define mutual inductance between a pair of coils. Derive an expression for the mutual inductance of two long coaxial solenoids of same length wound one over the other.
- 4.8π×10−4H
- 2.4π×10−4H
- 4.8π×10−5H
- 2.4π×10−5H
- 2 Wb
- 4 Wb
- 6 Wb
- 8 Wb
How does the number of turns affect inductance?
State any two uses of eddy currents?
In an electric circuit, two resistors of 12 Ω each are joined in parallel to a 6 V battery. Find the current drawn from the battery.
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1383672/original_2.png)
Assume that the area of the smaller coil is very small.
- A
- B
- C
- The same in all situations
![](https://search-static.byjusweb.com/question-images/byjus/infinitestudent-images/ckeditor_assets/pictures/735589/original_31.png)
- √34l2R
- 4√3l2R
- √34Rl2
- 4√3Rl2
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1371274/original_0001.png)
- 125 V
- 254 V
- 754 V
- 75 V
passing through 4 Ω resistance will be zero.
![](https://search-static.byjusweb.com/question-images/byjus/infinitestudent-images/ckeditor_assets/pictures/16143/content_1.png)
- 1Ω
- 2Ω
- 3Ω
- 4Ω
The mutual inductance between two coils is 1.25 henry. If the current in the primary coil changes at a rate of 80 ampere/second, then the induced e.m.f. in the secondary coil is
12.5 V
64.0 V
0.016 V
100.0 V
The correct relation between (ratio of collector current to emitter current) and (ratio of collector current to base current) of a transistor is
- l/L
- l2/L
- L/l
- L2/l
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1250829/original_%E2%82%AC1.png)
- 5 Ω
- 10 Ω
- 15 Ω
- 20 Ω
- 6π2×10−7 Nm
- 3π2×10−7 Nm
- 9π2×10−7 Nm
- 12π2×10−7 Nm
If an electric current flows in a clockwise direction in a circular loop, facing towards you, which magnetic pole is observed by you?
How does the mutual inductance of a pair of coils change when distance between the coils is increased?
An air core solenoid has 1000 turns and is one metre long. Its cross – sectional area is 10cm2. Its self – inductance is
2.56 mH
1.92 mH
1.26 mH
2.78 mH